JPH0716057B2 - Magnetic parts for high voltage pulse generation - Google Patents

Description

The present invention relates to a magnetic component for high voltage pulse generation used in a discharge excitation laser such as an excimer laser or an accelerator.

[Prior Art] As an example of a high-voltage pulse generator, a circuit using a magnetic compression circuit used in a discharge excitation laser such as an excimer laser is shown in FIG. In the figure, 31 is a DC power supply, 32 is a charging resistor, 33 is a thyratron, 34 is an inductance for delaying the rising time of the anode current of the thyratron 33, 35 is a main capacitor, 36 is a capacitor,
37 is a saturable reactor, 38 is a charging inductance, 39
Is wiring inductance, 40 is peaking capacitor, 41
Is a gap for UV (ultraviolet) preionization, 42 is a wiring inductance, and 43 is a laser main discharge electrode. For the operation of this circuit, see, for example, I. Similanski, SRByron and TRB.
urkes: “Electrical excitation of an XeCl laser usi
ng magnetic pulse compresson ", Appl.phys.Lett.40
(7), 1 April 1982, see.

As another example of the high voltage pulse generator, FIG. 5 shows an example of a high voltage pulse generator circuit used in an induction accelerator which is a kind of accelerator used in a free electron laser or the like. In the figure, 61 is a DC power supply, 62 is a charging resistor, 63 is a thyratron, 64 is a main capacitor, 65 is a transformer, 66 is a primary winding of the transformer 5, 67 is a secondary winding of the transformer 65, and 68 is a secondary winding. Is a capacitor, 69 and 71 are saturable reactors, 70 is a pulse shaping circuit, and 72 is an accelerator cell. Regarding the operation of this circuit, for example, D.Birx, E.Cook, S.Hawkins, S.Poor, L.Reginato, J.Schmid
t and M. Smith: “The application of magnetic switch
es as pulse sources for induction linacs, IEEE Tran
s.on Nuclear Science ", Vol.NS-30, No.4, pp.2763-276
See 8.

In magnetic components such as saturable reactors, transformers, and accelerator cells used in these high-voltage pulse generators, layers of magnetic ribbon such as amorphous alloy with excellent short-pulse magnetic characteristics are used such as polyester film between layers. It is used by stacking wound magnetic cores which are insulated by coating with a polymer film or an insulating material such as MgO.

[Problems to be Solved by the Invention] In the magnetic component for high voltage pulse generation as described above, heat generation due to magnetic core loss becomes a serious problem during high repetition operation of high voltage pulse generation.

For example, this heat damages a polymer sheet such as a polyester film used as an interlayer insulating material of the magnetic core, which breaks the interlayer insulation and increases overcurrent loss, or when an amorphous alloy magnetic core is used. However, there is a problem that the magnetic characteristics are deteriorated by this heat generation.

With respect to this problem, the present inventors have noticed that the thermal conductivity in the radial direction of the magnetic core is significantly smaller than the thermal conductivity in the end face direction due to the presence of the insulating material as described above, and the magnetic core end face is efficiently A magnetic component for high voltage pulse generation having a cooling structure was applied as Japanese Patent Application No. 63-142425.

FIG. 6 is a sectional view showing an example thereof, showing an example of application to a saturable reactor. In the figure, 81 is an input end or an output end, 82 is a coaxial cylindrical conductor, 83 is an output end or an input end, 84 is an oil inlet, 85 is an oil outlet, and 86 is an amorphous magnetic alloy ribbon and is used to insulate between layers. Winding magnetic core coated with a film or insulating coating, 87 and 88 are ring-shaped insulators that fix the magnetic core 86 and block the flow of oil, and 89 and 90 prevent the magnetic core from coming into contact with each other, and end faces of the magnetic core. Is a ring-shaped insulator for cooling the oil evenly, and 91 is an insulator having a mechanism for insulating the input and output ends and sealing oil. Further, in the drawing, the cooling oil flows from the oil inlet 84 in the route indicated by the arrow in the drawing, →→→, uniformly cools the end faces of the respective magnetic cores, and is circulated by the pump via the oil outlet 85.

In the magnetic component for high voltage pulse generation having such a structure, the temperature rise of the magnetic core due to the magnetic core loss is large especially during high repetition operation, and in order to prevent this, it is necessary to increase the flow velocity of the refrigerant such as cooling oil. Therefore, the pressure at the refrigerant inlet of the magnetic component (oil inlet 84 in FIG. 6) is 2 kg / cm ²
It is set to a degree or more. In this case, the wound magnetic core using the amorphous magnetic ribbon used for this magnetic component and having an insulating film or insulating coating between layers is deformed by external pressure in the end face direction, and in extreme cases, A refrigerant passage provided between two adjacent winding magnetic cores or a structure in contact with the magnetic core (the refrigerant passage is cut off in FIG. 6 and may lead to the ejection of the refrigerant. Even if it does not reach the above condition, there is a problem in that the magnetic passage is deformed as described above, so that the magnetic core cannot be cooled uniformly and a heat spot is generated in the magnetic core. The characteristic change was remarkable especially when an amorphous magnetic core was used.

As a method of preventing the deformation of the magnetic core in the end face direction,
Conventionally, a method of fixing the end surface of the wound magnetic core by a varnish impregnation treatment or the like has been used. However, in this case, there is a problem that the end face of the magnetic core is coated with varnish or the like by the impregnation treatment, and it becomes difficult to cool that portion.

Further, as the magnetic ribbon forming the magnetic core, when a magnetic ribbon whose saturation magnetostriction constant is not less than about 10 ⁻⁵ , such as an iron-based amorphous magnetic thin film, is used, the varnish impregnation treatment is performed. There is also a problem that the magnetic properties of the wound magnetic core are significantly deteriorated due to the stress applied to the wound magnetic core.

An object of the present invention is to solve the above problems, and to provide a magnetic component for high voltage pulse generation, which has a structure for efficiently cooling the end face of the magnetic core and preventing deformation of the magnetic core.

[Means for Solving the Problems] The present invention relates to a high-voltage pulse-generating magnetic component in which a plurality of winding magnetic cores are superposed and a flow path for passing a coolant is provided between the magnetic cores, and between the end faces of the magnetic cores. A magnetic component for high-voltage pulse generation, characterized in that a spacer having a protrusion that contacts at least one end face of the two magnetic cores forming between the end faces and holds a circumferential gap between the end faces is provided. Is.

It is possible to prevent the end faces of the magnetic core from being deformed by the spacers, blocking the flow path of the coolant, and causing partial retention of the coolant.

This spacer is an outer peripheral spacer that holds the gap between the magnetic core end surface by the protrusion that extends from the outer peripheral portion of the magnetic core to the inner peripheral direction, and an inner peripheral spacer that maintains the gap between the magnetic core end surface by the protrusion that extends from the inner peripheral portion of the magnetic core toward the outer peripheral direction. When configured, it is preferable that the flow path of the refrigerant on the end surface of the magnetic core is less obstructed.

In the magnetic component for a high-voltage pulse generator, when a wound magnetic core formed by applying an insulating tape or insulating coating between the magnetic ribbons is used, the thermal conductivity in the end face direction of the magnetic core is the same as that of the magnetic core. Due to its good radial thermal conductivity, its cooling efficiency is significantly improved.

Further, in the magnetic component for high voltage pulse generation, by using a magnetic core whose end surface of the winding magnetic core is not impregnated, deterioration of magnetic characteristics by the impregnation treatment and cooling efficiency by a coating layer formed on the end surface with the impregnation treatment The decrease can be prevented.

In the above-mentioned magnetic component for high voltage pulse generation, particularly when the wound magnetic core is made of an amorphous alloy, deterioration of magnetic characteristics due to a heat spot due to magnetic core loss during operation can be prevented, which is particularly preferable.

Further, it is preferable to use the above-mentioned magnetic component for high voltage pulse generation as a saturable reactor, a transformer or an accelerator cell from the viewpoint of improving reliability during high repetition operation.

[Examples] Examples of the present invention will be described in detail below.

(Embodiment 1) FIG. 1 is a sectional view of a saturable reactor which is an embodiment of a magnetic component for high voltage generation according to the present invention. In the figure, 1 is an input end, 2 is a coaxial cylindrical conductor that constitutes a winding of 1 turn, 3 is an output end, 4 is an oil inlet, 5 is an oil outlet, and 6 is polyester between amorphous magnetic ribbons.・ Terephthalate ・
It is a wound magnetic core formed by insulating with a film.

Numerals 7 and 8 are ring-shaped insulators having a function of fixing the winding magnetic core 6 and blocking the flow of oil, 9 are inner peripheral spacers, 10a and 10b are outer peripheral spacers, and these spacers are insulators such as vinyl chloride. In order to prevent the magnetic core 6 from coming into contact with each other and the structure and to secure an oil flow path, a protrusion 14 is provided to prevent the end face of the magnetic core from being deformed.

Reference numerals 11 and 12 are ring-shaped insulators, and 13 is an insulator having a function of insulating the input / output ends and sealing oil.

Further, in the figure, the cooling oil flows in the path of the arrow →→→ to uniformly cool the end faces of the respective magnetic cores, and exits the oil outlet 5 to be circulated by the pump.

2 and 3 show the saturable reactor A shown in FIG.
FIG. 7 is a view taken along arrows -A 'and BB'. As shown in these figures, the protrusions 14 are provided on the spacers 9, 10a, 10b made of an insulating material to prevent the winding core 6 from being deformed due to the stress applied from the end face direction of the winding core 6. In the case of the structure shown in FIG. 1, the cooling oil can evenly cool the end face of the flow winding magnetic core 6 in the direction of the arrow shown in FIGS. 2 and 3.

(Embodiment 2) FIG. 7 shows a configuration diagram in the case where the spacers 9, 10a, 10b of Embodiment 1 are changed so that cooling oil flows so as to traverse the winding core 6 radial direction. Further, FIG. 8 shows a view taken along the line CC 'in FIG. The arrows in the figure indicate the direction in which the cooling oil flows.

Similar effects can be obtained even when the cooling oil flows in the radial direction of the magnetic core. Further, in this case, the flow of the cooling oil is not very blocked by the protrusions 14, so that there is an advantage that the cooling oil is less likely to stay and the heat spot is less generated than in the first embodiment.

In the above embodiment, an example of applying the saturable reactor, which is one of the magnetic parts for the high voltage pulse generator, is shown, but the present invention can be applied to other magnetic parts such as a transformer and an accelerator cell. Needless to say.

[Effect of the Invention] According to the present invention, it is possible to prevent deformation of the wound magnetic core due to external stress, which has been insufficient in the past, and to uniformly cool the magnetic core.
It is possible to prevent deterioration of the magnetic characteristics of the magnetic core due to the generation of heat spots and the like.

In particular, it is effective to apply the present invention to an amorphous magnetic core whose magnetic characteristics may change significantly due to heat generation.

Further, it is not necessary to impregnate the end faces of the magnetic core with varnish or the like, and when a material having a large magnetostriction is used, deterioration of magnetic characteristics can be prevented, and an excellent magnetic component for a high voltage pulse generator is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a view taken along the line AA ′ in FIG. 3, FIG. 3 is a view taken along the line BB ′ in FIG. 1, FIG. 4 is a view showing a high voltage pulse compression circuit in a discharge pump laser, and FIG. 5 is an induction accelerator. Showing a high voltage pulse generating circuit in FIG. 6, FIG. 6 is a sectional view showing a comparative example to the present invention, FIG. 7 is a sectional view showing another embodiment of the present invention, and FIG. 8 is a C- of FIG. It is a C'arrow view. 1: Input end, 2: Coaxial cylindrical conductor, 3: Output end, 4: Oil inlet, 5: Oil outlet, 6: Winding core, 7,8: Ring insulator, 9,10a, 10b: Spacer, 14: protrusion

Claims (5)

[Claims] 1. A magnetic component for high-voltage pulse generation, wherein a plurality of wound magnetic cores are superposed and a flow path for passing a coolant is provided between the magnetic cores, wherein two end faces are formed between the end faces of the magnetic cores. A magnetic component for high-voltage pulse generation, characterized in that a spacer having a protrusion that contacts at least one end face of each of the two magnetic cores and holds a circumferential gap between the end faces is provided. 2. The spacer comprises an outer peripheral spacer having a protrusion extending from the outer peripheral portion of the magnetic core to the inner peripheral direction, and an inner peripheral spacer having a protrusion extending from the inner peripheral portion of the magnetic core to the outer peripheral direction. The magnetic component for generating a high voltage pulse according to claim 1, wherein the magnetic component is in contact with a part of the end surface of the magnetic core in the circumferential direction. 3. The magnetic component for high voltage pulse generation according to claim 1, wherein the magnetic core is an amorphous alloy. 4. The magnetic component for high voltage pulse generation according to claim 1, wherein the magnetic component for high voltage pulse generation is a saturable reactor. 5. The magnetic component for high voltage pulse generation according to claim 1, wherein the magnetic component for high voltage pulse generation is an accelerator cell.